Electrically-controlled puller for oil-well casings



ELECTRICALLY CONTROLLED PULLER FOR OIL WELL CASINGS APPLICAHON FLLED APh. 26, 1921.1

1,374,833. Patented Apr. 12, 1921.

i j/C/ 12;-, Q

UNITED STATES PATENT oFFici-z.

wILLrAiri D. D`ooLEY,.or DALLAS, TEXAS, Assiefiioii,v BY Mnsivii ASSIGNMENTS; To

L. D. nowsnn, or DALLAS, TEXAS.

ELECTRIALLY-CONTROLLEI) P'ULLERFOR OIL-WELL CASINGS.k

nai/asas.

Application filed April 26, 1920. .Serial-No. 376,631.

Be it known that I, WiLLmM D. DooLnY, a citizen ofthe United States, residing at Dallas, in the county of vDallas and State of Texas, have invented certain new and useful Improvements in Electrically-Controlled Fullers for 4Gil-Vlell Casings, of which the following is a specification, reference ybeing had therein to the accompanying drawing.

rlfliis invention relates to improvements in electrically controlled pullers for oil well casings, which is adapted to be lowered rinto the well within the casing toy be pulled and locked with its inner wall tor pulling the casing out of the well. V VThe primary object of this ninvention is to provide an oil wellv casing puller which has electrically controlled members adapted to lool; against the inner wall of the casing and pull it out of the well. n Janother object of my invention is to provide a casing puller which is providedwith members that automatically lock against the inner wall of the casing and electromagnets for holding theinembers in their unlocked positions tor releasing it from the casing, wherebythe pulley may be'moved up and doiwn in the casing at will and caused to either lock with they casing of the well at any desired point, or to bereleased from its locking action atany desired point in the casing. f

Another object4 of my present improvement is to provide casingy puller which carries a pluralityl of ball wedges, which autoinatically4 lool; `with the inner wall of the casing, and anelectromagnet for each ball to hold it out of its locking position.

Further objects of my present improvements will appear fromy the drawings and specilications.

' Specification of Letters Patent.

Patented Apr. 1,2, k1921.

a plurality oi'f electrically controlledmeinbers which are adapted to be moved into` locking` and unlocking positions in respect to .the well casing 3.-

These looking members 4are arranged in horizontal series around the body l, coinprising an upper series t and a lower series 5, rlhe upper series of locking members, here shown, comprise balls 6, which are located in inclined sleeves 7. These Sleeves 7 are .within inclined passage-ways 8, that are formed in the body l. These passagewaysS are formed/byy boring through the body lirom its upper end 9 at an` inclination which brings their ends l0 through the side ci' thebody fl, as clearly shown in the drawing. The sleeves 7 are composed of brass or other non-magnetic material, and the balls (Sk are of a size to freely move within the sleeve, so that they normally fall to the lowerendso the sleeves, as shown. The lower ends ll of the upper sides of the sleeves 7 vare slightly turned inward, as shown, and engage the balls 6 just rbelow Vtheir center,v so that normally their peripheiies project beyond the outer side of the body l., so that they will normally engage theinner face of the well-casingz. These pullers` ai'emade of a size slightly smaller than the interior diameter of thev casing that iste be pulled. The Linturnedlower edges of the' Sleeves j7 prevent the balls 6 `from falling outot the sleeves,'but permits them` to project suiliciently 'far to engage the wall of the tube@ The body 1 of the puller will be made of such diameter, relative, to the-interior diameter of the'casiiig 3,that when it is within the casing the, balls will be Slightly lifted above the upper inturned edges of the sleeves 7 so that they will be permitted a slight farther down movement for causing them to wedge against the inner wall of the casing 3 and have a cam-lookin(r action. There ma be f 14 extending upward into a housing ring 15, which is placed around the screw-threaded stud 16 to receive the lower end of the pulling rod 17. The electro-magnet leads 14 pass into a suitable covering 18 and extend to the top or the well, where they will be connected with any desired electrical source and controlled by any suitable switch (not shown), rlChis housing ring 15 is attached to the upper end of the body 1 by means of suitable bolts 18, and the leads 14 are embedded in suitable waterproof cement 19, which iills the housing ring 15.

ln operation` the lifting tool is lowered f into the .well casing to the desired point and the locking balls may be drawn upward in the sleeves 7, by the electro-magnets, as shown in Fig. 4, to prevent them from engaging the casing, so that the puller can be freely moved, up and down in the casing until the desired location therein is obtaine At this time, the balls are released by making the electric circuit and they fall to the positions shown in Figs. 2 and 4, whereby they will engage the inner wall of the casing 3, so that an upward pull on the tool will cause the balls to roll downward and form locking wedges between the casing and body 1. The casing may then be pulled or lifted as nesired. The puller can be released at any time from the casing by simply permitting it to drop slightly and then closing the circuit i'or magnetizing the magnets 13 to lift the balls within their slee-ves, permitting the tool to be moved up and down freely within the casing.

From the foregoing it will be observed that the locking members 6 are normally in their locking positions, but are held in their unlocked positions by energizing the electromagnets 13.

l do not limit myself to the exact construction here shown, 'for that may be varied by those skilled in the art without departing from the spirit and scope of my invention, as delined in the following claims.

Having thus described my invention, what l claim and desire to secure by Letters Patent is 1. A casing puller, comprising a body having a plurality of normally projecting locking members and a plurality of electromagnetsv for holding the locking members in their unlocked positions.

2. A casing puller comprising a body having a plurality of inclined passages opening through the side of the body, a locking ball inf each passage, and an electro-magnet in each passage for holding the ballsl in their unlocked positions. y

3. A casing puller comprising a body portion, having a plurality of outwardly inclined passages with their upper ends opening at the top of the body and their lower ends passing out of the'side of the body, a plurality of locking balls in the passages, the lower end wall of the passage constructed to hold the balls therein with their peripheries vprojecting beyond the body, and an electro-magnet in each passage having leads extending to the top of the well, whereby the locking balls are held in their unlocked position when the magnets are electrically energize o 4. A casing puller comprising a body having upper and vlower series of outwardly inclined passage-ways with their lower ends passing out through the body at different elevations, a locking ball 'in each passage adapted to project beyond the outer surface of the body, an electro-magnet in each passage, the magnets having leads extending upward through the well for the purpose of energizing the magnets and holding the locking balls in their unlocked positions.

A casing puller comprising a body having an inclined passage with its lower end opening through the outside oi the body, a loci-:ing ball adapted to have its periphery project beyond the outer face of the body and an electro-magnet adapted to lift and hold the ball in its unlocked position.

6. A casing puller comprising a body having an outwardly inclined passageway, a brass tube within the passage, a ball within the passage, an electro-magnet within the passage and above the ball, whereby the ball may be lifted to its unlocked Vposition by electrically 'energizing the magnet.

ln testimony whereof I hereunto aflix my signature,

WILLIAM D. DOOLEYv 

